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Text File  |  1991-11-17  |  292b  |  20 lines
  1.  
  2. Listing 9
  3.  
  4. //
  5. // operator-
  6. //
  7. rational rational::operator-(rational r)
  8.     {
  9.     return rational(num * r.denom - r.num * denom,
  10.         denom * r.denom);
  11.     }
  12.  
  13. //
  14. // operator-= written in terms of operator-
  15. //
  16. rational &rational::operator-=(rational r)
  17.     {
  18.     return *this = *this - r;
  19.     }
  20.